Waukesha, WI weather and climate in 2024
Day
20 °C
Night
8 °C
Sea
6 °C
Precipitation
84 mm
in month
Rainy days
12 days
in month
Daylight
14 hours
average
Sunshine
9 hours
average
Humidity
67 %
Day
20 °C
Night
8 °C
Sea
6 °C
Precipitation
84 mm
in month
Rainy days
12 days
in month
Daylight
14 hours
average
Sunshine
9 hours
average
Humidity
67 %
Overview: Waukesha, WI
Weather charts for Waukesha, WI
We make the most from 40 years of historical weather data to predict the best weather conditions.
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Weather overview for Waukesha, WI
Weather overview
Waukesha, Wisconsin experiences four distinct seasons marked by a wide range of temperatures and weather conditions. Winters are cold with average daytime highs just below freezing and chilly nights that can dip quite low. Summers, by contrast, are warm and can occasionally be hot, with temperatures peaking in July. Precipitation is fairly even throughout the year, with occasional peaks that can bring delightful bouts of snow in winter or warming thunderstorms in summer. While there is no dry or wet season, the overall humidity throughout the year adds a particular feel to the temperature, making it feel cooler at times and stickier during summer months.
January weather
January brings the chill of winter to Waukesha with daytime temperatures struggling to rise above the freezing mark, averaging around -2 °C (28 °F). Nights are particularly cold this month, with the average minimum temperatures dropping to -11 °C (13 °F), so it's essential to layer up if you're heading out.
February weather
In February, the frigid grip of winter persists with only a slight uptick in daytime temperatures, averaging 0 °C (32 °F). Nighttime temperatures remain chilly, lingering at an average of -8 °C (17 °F). This is definitely a month for warm woolens and hot beverages to keep the cold at bay.
March weather
March sees the first hints of spring, as daytime temperatures start to climb, reaching average highs of 6 °C (43 °F). The nights are still frosty, with an average minimum temperature of -3 °C (26 °F). The transition between seasons can bring unpredictable weather, so stay prepared for anything from sun to late-season snow flurries.
April weather
April offers a breath of fresh air, with average daytime temperatures at a comfortable 13 °C (56 °F). Nighttimes start to thaw too, averaging 3 °C (37 °F). With the increase in temperatures, there is a rise in rainfall, averaging 83 mm (3.27 in), perfect for jump-starting the growing season.
May weather
May marks the true beginning of warmer weather in Waukesha, with daytime temperatures rising to a pleasant 20 °C (67 °F). Nights are milder too, with an average low of 8 °C (46 °F). Flowers are in bloom, and the fresh greenery makes outdoor activities particularly enjoyable this month.
June weather
In June, summer is in full swing with temperatures peaking at an average high of 25 °C (77 °F) during the day and mild nights averaging 13 °C (56 °F). Humidity starts to increase this month, and you can expect an average of 69 % relative humidity, along with 102 mm (4.03 in) of rainfall which can include thunderstorms that cool down the evening air.
July weather
July is the warmest month of the year in Waukesha, with the mercury climbing to an average maximum of 27 °C (81 °F). Nightly lows are comfortable at 16 °C (61 °F). The humidity levels can make the heat feel more intense, so staying hydrated and wearing breathable clothing is advisable.
August weather
August's warmth continues with average daytime highs of 26 °C (80 °F). Expect milder nights with average lows of 16 °C (60 °F). A slight dip in sunlight hours doesn't detract from enjoying the great outdoors, and occasional rain brings relief from the heat.
September weather
September sees the start of the fall season in Waukesha, with a noticeable decline in daytime temperatures to an average of 23 °C (73 °F). Nights begin to cool down appreciably, dropping to an average of 11 °C (52 °F). The change of season brings a certain crispness to the air that's both refreshing and energizing.
October weather
In October, autumnal chill steadily sets in as daytime temperatures drop to an average high of 15 °C (59 °F). Nights can be quite cool with typical minimum temperatures of 5 °C (41 °F). The changing leaves offer a picturesque backdrop, but don't forget to dress in layers to adjust to fluctuating temperatures.
November weather
November brings the onset of colder temperatures, paving the way for winter. Daytimes see a significant decline in temperatures, averaging 7 °C (45 °F) while nights can be quite cold, with average lows of -1 °C (30 °F). The diminishing sun hours and potential for snow later in the month indicate the approach of winter weather.
December weather
December ushers in the full onset of winter, with temperatures averaging a chilly 0 °C (32 °F) during the day and plunging to around -8 °C (17 °F) at night. Despite the cold, the holiday season adds a warm spirit to the community as decorations light up the streets.
FAQs
How cold can Waukesha get in January?
January in Waukesha is quite cold with the mercury often below freezing during the day at -2 °C (28 °F), and nighttime lows typically around -11 °C (13 °F). Extra layers and warm clothing are non-negotiable if you plan to be outdoors.
Will I need a heavy coat in Waukesha during February?
A heavy coat is an absolute necessity in Waukesha throughout February. With daytime highs barely cresting the freezing point at 0 °C (32 °F) and nighttime lows around -8 °C (17 °F), you'll need all the insulation you can get.
Is March in Waukesha still considered winter-like?
Although March marks the onset of spring, Waukesha can still exhibit winter-like conditions, with daytime temperatures averaging 6 °C (43 °F) and possible snowfalls early in the month. As the month progresses, milder conditions start to appear.
What type of clothing is best for April weather in Waukesha?
Layering remains your best bet for April in Waukesha. Comfortable day temperatures of 13 °C (56 °F) can dip at night to 3 °C (37 °F), so be ready to shed or don layers according to the changing conditions.
Is May typically a warm month in Waukesha?
May is when Waukesha begins to warm up significantly, and you can expect comfortable daytime temperatures at an average of 20 °C (67 °F). It's an excellent month for enjoying time outside as the landscape turns lush and green.
How hot does it get in Waukesha during June?
June in Waukesha can get quite warm with average daytime highs of 25 °C (77 °F), making it perfect for picnics and other outdoor summer activities. Light clothing is generally sufficient unless there's an unusual cold snap.
What's the typical daytime temperature in Waukesha in July?
Typical daytime temperatures in Waukesha in July hover around 27 °C (81 °F), so you can expect hot days perfect for enjoying the height of summer.
Does the temperature in Waukesha change much from July to August?
The temperature in Waukesha from July to August doesn't change drastically. August maintains summery warmth with an average high of 26 °C (80 °F) during the day, just slightly cooler than July.
Is September a comfortable month to be outside in Waukesha?
September in Waukesha is generally very comfortable for outdoor activities, with average highs of 23 °C (73 °F) and the fresh, crisp air that signals the beginning of fall.
Can I still enjoy outdoor activities in Waukesha during October?
Outdoor activities in October are still very much enjoyable in Waukesha, with daytime temperatures averaging 15 °C (59 °F). Keep in mind that layers are key as the weather can change throughout the day.
How does the weather change in Waukesha during November?
The weather in November in Waukesha shifts towards colder conditions, with average daily temperatures falling to 7 °C (45 °F) and nights getting quite frosty. Preparations for the approaching winter are evident as you start to see your breath in the crisp air.
Are winters harsh in Waukesha during December?
Winters can be quite harsh in Waukesha during December, with average daytime temperatures just below freezing at 0 °C (32 °F) and cold nights averaging -8 °C (17 °F). Staying warm is crucial, and seasonal festivities offer a chance to enjoy the winter wonderland.
We make the most from 40 years of historical weather data to predict the best weather conditions.
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.